摘要
本试验以东祁连山杜鹃灌丛草地、高山柳灌丛草地和金露梅灌丛草地为研究对象,对土壤微生物量和土壤酶的季节性动态等进行了研究。结果表明,土壤微生物量碳的季节动态表现为从5月到7月显著上升(P<0.05),之后到9月显著下降(P<0.05),9月到11月又略有上升,最大值和最小值分别出现在7月和9月;除高山柳灌丛草地土壤微生物量氮外,土壤微生物量氮和磷季节动态为从5月到9月显著下降(P<0.05),9月后又略有上升,但差异不显著,最大值在5月;土壤微生物量碳、氮和磷分别对土壤有机质、全氮和全磷的贡献率季节动态与微生物量碳、氮和磷季节动态基本一致;土壤微生物量碳氮比介于5.79～10.31,最大值出现在7月,最小值出现在9月,下层高于上层。在3个灌丛草地,脲酶季节动态表现为从5月到7月上升,7月之后下降,最大值出现在7月,最小值出现在11月;杜鹃灌丛草地和高山柳灌丛草地中性磷酸酶最大值在11月,但金露梅灌丛草地最大值在9月,该酶在3个灌丛草地季节动态差异明显,在杜鹃灌丛草地从5月到7月略上升,7月到9月显著下降(P<0.05),9月后显著上升(P<0.05),在金露梅灌丛则为从5月到9月上升,后下降,而在高山柳灌丛则为从5月到11月逐渐上升。
The soil microbial biomass and enzymatic activities were studied under Rhododendrons alpine brush lands（RB）,Salix cupularis alpine brush lands（SB） and Dasiphoru fruticosa alpine brush lands（DB） of the Eastern Qilian Mountains in the Qinghai-Tibetan Plateau,China.The seasonal trend of soil microbial biomass carbon（SMBC） increased significantly from May to July（P0.05）,and then fell significantly from July to September（P0.05）,before increasing again until November across all three sites.However,the soil microbial biomass nitrogen（SMBN） and the soil microbial biomass phosphorus（SMBP） significantly decreased from May to September then increased again after September except that the SMBN under SB decreased from May to November.The seasonal dynamics of SMBC/soil organic matter（SOM）,SMBN/soil total nitrogen（STN） and SMBP/soil total phosphorus（STP） showed similar trends to the SMBC,SMBN and SMBP,respectively.The annual mean ratio of SMBC/SMBN was 5.79-10.31： this was higher in the lower than in the upper layer.The maximum was in July and the minimum in September.Urease activities gradually increased from May to July,and then decreased after July across all three sites.The seasonal dynamics of neutral phosphatase activities（NPA） increased from May to July,but significantly（P0.05） decreased from July to September,and then gradually increased after September at RB.At SB,the NPA gradually increased from May to November while at DB,it increased from May to September,and then decreased after September.
出处
《草业学报》
CSCD
北大核心
2011年第6期135-142,共8页
Acta Prataculturae Sinica
基金
甘肃省自然科学基金(096RJZA003)
退化草原植被恢复与碳固定之间的研究(052456CHA-GS-Y-4)资助
关键词
东祁连山
高寒草地
土壤微生物量
土壤酶
季节动态
eastern Qilian Mountains
alpine brushland
soil microbial biomass
enzymatic activity
seasonal dynamics
